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The decomposition of a gaseous substance...

The decomposition of a gaseous substance (A) to yield gaseous products (B),(C) follows first order kinetics. If initially only (A) is present and "10" minutes after the start of the reaction, the pressure of "(A)" is "200mmHg" and the total pressure is "300mmHg" ,then the rate constant for reaction \(A \rightarrow B+C\) is

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